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|Title:||An investigation into attentional blink - The attentional engagement hypothesis||Authors:||TAN WAH PHEOW||Keywords:||Attention, Attentional, Blink, Repeat, Engagement, Visual||Issue Date:||7-Feb-2006||Citation:||TAN WAH PHEOW (2006-02-07). An investigation into attentional blink - The attentional engagement hypothesis. ScholarBank@NUS Repository.||Abstract:||When participants are required to identify two targets presented in a rapid serial visual presentation (RSVP), identification of the second target is affected when it appears within 500 ms of the first target. This phenomenon has been termed the attentional blink (AB). In the current thesis, the lag 1 distractor is varied in order to manipulate the pattern of AB attenuation. In Experiment 1a and 1b, a repeat-T1 distractor that was identical to T1 was inserted in lag 1. The repeat-T1 distractor was in target and distractor luminance in Experiment 1a and 1b respectively. It was found that inserting a repeat-T1 in target luminance led to an improved T2 performance at lag 2, while this was not found when the repeat-T1 was in distractor luminance. The extant AB models could not account for the pattern of results obtained. A new AB model based on temporal attentional shift (Chua, 2005; Wee & Chua, 2004), the temporal coding hypothesis (Dixon & Di Lollo, 1994), and the theoretical ideas of Loftus and his associates (e.g., Busey & Loftus, 1994) is introduced. This model, named the Attentional Engagement Hypothesis, could account for the data in Experiment 1. The main hypothesis of this model is that AB occurs because attention fails to disengage from a previous target rapidly enough. It is hypothesized that attentional disengagement from a target is modulated by how rapidly the visual system can detect the targeta??s termination. The argument in this thesis is that target termination is signaled to the visual system when (a) an object change is detected, or (b) the visual system senses that there is no more information available for acquisition from the target. In order to test this new model, a double-stream RSVP presentation was employed in Experiment 2a, 2b and 2c. The lag 1 distractor varied was a repeat-T1, a chimeral distractor, and a four-dot distractor for Experiment 2a, 2b and 2c respectively. The findings from these experiments support the Attentional Engagement Hypothesis. There are several implications from the findings in this thesis: (a) it argues for the dissociation between attentional control and stimulus processing; (b) it places the AB phenomenon as an early selection issue; and (c) it argues for a lower boundary of temporal limit for visual attention.||URI:||http://scholarbank.nus.edu.sg/handle/10635/18887|
|Appears in Collections:||Master's Theses (Open)|
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